PM2.5 refers to particulate matter with a diameter of up to 2.5 micrometers, and is one of the most dangerous air pollutants. Due to its small size, PM2.5 particles can penetrate deep into the lungs, causing various health problems. SUCH PM sensors enable innovative air quality monitoring devices that detect ash buildup within filters using radio frequency (RF) signals, preventing dam... https://www.such.com/pm-sensor